Goodwill And Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 968,834
Goodwill, Adjustments	15,454
Goodwill, Ending balance	984,288
Intangible assets, Beginning balance	109,627
Intangible assets, Net Additions	12,080
Intangible assets, Amortization	(2,738)	$ (2,981)
Intangible assets, Ending balance	118,969
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	276,477
Goodwill, Adjustments	13,912
Goodwill, Ending balance	290,389
Intangible assets, Beginning balance	44,525
Intangible assets, Net Additions	10,800
Intangible assets, Amortization	(1,097)
Intangible assets, Ending balance	54,228
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	692,357
Goodwill, Adjustments	1,542
Goodwill, Ending balance	693,899
Intangible assets, Beginning balance	65,102
Intangible assets, Net Additions	1,280
Intangible assets, Amortization	(1,641)
Intangible assets, Ending balance	$ 64,741